Generally, a warm roof and a cold roof require different amounts of ventilation at the eaves, a cold roof required 10mm ventilation at the eaves and a warm roof requires 25mm ventilation at the eaves. Both a cold and warm roof require 5mm ventilation at the ridge - you always need more ventilation at the eaves than the ridge.
Disclaimer - The information shared in this blog is correct at the time of publication. Guidance, standards, and best practices may change over time, so if you’d like further clarification or the latest updates, please get in touch with the Marley Technical Advisory Team, who will be happy to help.